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        <time class="post-time" title="2020年03月18日 13:54" datetime="2020-03-18T05:54:38.403Z"  itemprop="datePublished">2020-03-18</time>

        
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        openlayers 样式渲染1. 样式渲染方式
ol.Feature.setStyle(style)
在每个Feature上设置响应的样式。

ol.layer.Vector.setStyle(style)
在图层设置样式


2. Feature.setStyle()要素设置样式在openlayers API中setStyle方法描述如下：
Set the style for the f...
    

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        <time class="post-time" title="2020年03月18日 13:37" datetime="2020-03-18T05:37:37.975Z"  itemprop="datePublished">2020-03-18</time>

        
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      <a class="post-title-link" href="/blog/2020/03/18/openlayers/openlayers加载ArcGIS自定义坐标系切片服务/">openlayers加载ArcGIS自定坐标切片服务</a>
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        openlayers加载ArcGIS自定坐标切片服务一、概述在实际的WebGIS开发中我们通常遇到的是WGS84的web 墨卡托投影及其经纬度投影，对应的SRID为EPSG:3857及EPSG:4326。但是由于实际的使用需求，我们通常回遇到一些北京54、西安80以及一些地方坐标系发布的地图服务，如果对于坐标系的理解不够深入，通常大费周章，不得其解。
现在利用这边文章，整理一下在自定义坐标系...
    

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        OpenLayers 学习笔记1.定制logonew ol.Map(&#123;    controls: ol.control.defaults(&#123;        attributionOptions: (&#123;          collapsible: false        &#125;)      &#125;),      // logo: false,    ...
    

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      <a class="post-title-link" href="/blog/2020/03/18/gis基本原理/瓦片计算工具类/">切片请求工具类</a>
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        javascript
module.exports = &#123;    /**     * 根据经纬度和缩放等级，求得瓦片路径     * @param &#123;*&#125; lat 纬度     * @param &#123;*&#125; lon 精度     * @param &#123;*&#125; zoom 缩放级别     */    getTileNumber(la...
    

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        Mapbox原码分析一、基本架构
                
                    
                    
                
                基本架构
            


1. 接口层Marker在Mapbox GL JS中Marker类似与openlayers中的overlay，以DOM元素的方式呈现信息...
    

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        瓦片请求原理影像金字塔
原始单张图标比较大，客户端请求时间长，渲染速度慢，或者渲染不了这么大的图像。
对不同分辨率的图像进行切片缓存，提高访问速度。

原理如下：

                
                    
                    
                
                tileMatrix
           ...
    

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        计算不规则多边形的质心/*** 获取不规则多边形重心点* @param points* @return*/export function getCenterOfGravityPoint(points) &#123;    let area = 0;//多边形面积    let gx = 0, gy = 0;// 重心的x、y    for (let i = 1, len = points.l...
    

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      <a class="post-title-link" href="/blog/2020/03/17/gis基本原理/比例尺及分辨率换算规则/">公网地图最大比例尺</a>
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        公网地图最大比例尺


地图名称
级别
scale
Resolution(像素/m)



智图
16
1:9027.977411
2.388657133974685


天地图
20
1:564.24971667206887
0.149291070


Google地图
19
1：1128.49717634498
0.298582141738936


百度地图
18
1：3779.53
...
    

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        <time class="post-time" title="2017年04月12日 19:36" datetime="2017-04-12T11:36:10.000Z"  itemprop="datePublished">2017-04-12</time>

        
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        线程安全问题非线程安全主要是指多个线程对一个对象中的同一个实例变量进行操作时会出现。
同步代码块为了解决线程安全问题，Java多线程引入了同步监视器来解决这个问题，同步监视器的通用方法就是同步代码块。定义如下：
synchronized(obj) &#123;    //此处的代码就是同步代码块&#125;

obj就是同步监视器，上面代码的含义是：线程开始执行同步代码块之前，必须先获得对同...
    

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        <time class="post-time" title="2017年04月12日 12:44" datetime="2017-04-12T04:44:58.000Z"  itemprop="datePublished">2017-04-12</time>

        
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        join线程Thread提供了让一个线程等待另一个线程完成的方法–join()方法当在某个程序执行流中调用其他线程的join()方法时，调用线程被阻塞，直到被join()方法加入的join线程执行完为止。
public class JoinThread extends Thread &#123;    public JoinThread(String name) &#123;        ...
    

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